<div class="widget news">
    <h3 class="title">订阅</h3>
    <form>
        <div class="form-group">
            <input type="text" placeholder="请输入邮箱">
            <button class="icon fa fa-paper-plane-o "></button>
        </div>
        <button class="btn btn-disabled">订阅</button>
    </form>
</div>